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Journal of Dairy Science Vol. 58 No. 12 1907-1909
© 1975 by American Dairy Science Association ®
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Erythrocyte {delta}-Aminolevulinic Acid Dehydrase Changes in the Preruminant Calf

G. P. Lynch, E. D. Jackson and D. F. Smith

Nutrition Institute, U.S. Department of Agriculture, Beltsville, MD 20705

ABSTRACT

Sixteen preruminant, male Holstein calves were tested for erythrocyte {delta}-aminolevulinic acid dehydrase activity, hemoglobin and erythrocyte count in blood samples taken weekly during the first 13 wk of life. {delta}-Aminolevulinic acid dehydrase showed a continual increase in activity beginning at wk 3 to a maximal activity at wk 9. Hemoglobin content was decreased by wk 5 and erythrocyte count was reduced by wk 6. {delta}-Aminolevulinic acid dehydrase enzyme activities increased with age corresponding to changes in hemoglobin and erythrocyte count during early postnatal development of the preruminant calf.






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Copyright © 1975 by the American Dairy Science Association ®.